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प्रश्न
How does algal bloom destroy the quality of a fresh water body? Explain.
उत्तर
An algal bloom is the phenomenon of excessive growth of planktonic forms in a nutrient rich water body. As the planktonic species multiply on the surface they from a layer that eventually covers the entire surface of the water body. They block sunlight, which does not reach submerged aquatic plants that may have a role in supplying necessary nutrients to other aquatic life forms and keeping the water clean.
Excretory substances released by planktons build up in concentration and pollute the water. Some algal species even release substances that are toxic for other life forms in the water body. Also, due to the high respiratory needs of such a huge concentration of biomass on the surface, the biological oxygen demand (BOD) of the water body increases, causing many of the life forms to die. Their carcasses further contribute to the deterioration of the quality of the water content.
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संबंधित प्रश्न
Explain how does the algal bloom eventually choke the water body in an industrial area?
Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.
Answer the questions based on the facts given above:
(i) Name the organisms depicting the patterns A and B.
(ii) State the reason for the growth pattern seen in A.
(iii) Write the effects of the growth patterns seen above.
Write critical notes Biological magnification
Write critical notes Groundwater depletion and ways for its replenishment
Answer the following question:
While on a visit to a pond in the city-neighborhood, the visitors were delighted to find a large expanse of water covered with colorful algal mass.
Explain the cause of such algal growth.
Biomagnification is caused mainly by ______.
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of ______.
Match the following and choose the correct option
| Column I | Column II | ||
| A. | Environment Protection Act | i. | 1974 |
| B. | Air Prevention & Control of Pollution Act | ii. | 1987 |
| C. | Water Act | iii. | 1986 |
| D. | Amendment of Air Act to include noise as an air pollutant | iv. | 1981 |
Match the following and choose the correct option:
| Column I | Column II |
| A. Environment Protection Act | i. 1974 |
| B. Air Prevention & Control of Pollution Act | ii. 1987 |
| C. Water Act | iii. 1986 |
| D. Amendment of Air Act to include noise as an air pollutant | iv. 1981 |
Match the following and choose the correct option.
| Column I | Column II | ||
| A. | Environment Protection Act | i. | 1974 |
| B. | Air Prevention & Control of Pollution Act | ii. | 1987 |
| C. | Water Act | iii. | 1986 |
| D. | Amendment of Air Act to include noise as an air pollutant | iv. | 1981 |
